Open String Diagrams I : Topological Type

  title={Open String Diagrams I : Topological Type},
  author={Subhashis Nag and P. G. Sankaran},
An arbitrary Feynman graph for string field theory interactions is analysed and the homeomorphism type of the corresponding world sheet surface is completely determined even in the non-orientable cases. Algorithms are found to mechanically compute the topological characteristics of the resulting surface from the structure of the signed oriented graph… CONTINUE READING